Chuck



Nov. 1, 1932. u AMYOT 1,885,790

CHUCK Filed Sept. 19, 1931 m, d a

PIERRE UwsE \JEAN A 707- mvawron;

Patented Nov. 1, 1932 smma rssm m mixer; or nouns;.JrItiancE;,. ssIGNon amassing or.

vmearnnmxom oEIzEsGRAs nouns rlmucn, a IMIT ItooMPANx QEEHAMGEX I muck,

' ytion'alwith the resisting forces: acting:- on

-tl1eobject=heltl.- j 1 (21') to: enable easy release ofsthe :work, the *releasin'g efiort rthereof being inferior to i the resisting forc'es inquestionai a 7 3 to ensure easy: construction; and: fitting ot the chuclc and, by" decreasing the number of its parts, to obtain low 'costipricesg.

to enable the 1 play of" thewinner parts of the chuck to be easily taken'au'pr (5.) to: ensure the hold. of the gripping parts, this grip increasing in proportion with their distance apart, i. e. with the diameter of the object gripped, and therefore the stress required from them.

(6) to enable the chuck to be tightened or loosened without the use of keys, levers or other accessory tools. V

A chuck with which the aforesaid objects can be attained, according to the invention, consists essentially in the essential features described in the following description and defined in the claims at the end thereof.

Two chucks, according to the invention,

.fi-rm grip: Without any; possibility, of." slipare illustrated, by way of example, in the accompanying drawing wherein;

Fig. 1 is an outside elevation of a chuck.

Fig. 2 is a sectional elevation through the axis of the chuck.

Fig.3 is an elevation in part section of the chuck, showing'the inner parts.

Fig. t is an axial section of a modified form of chuck according to the invention.

In the chuck shown in Figs. 1 to 3 the central part c'is forced onto and grips the shank g which participates in the rotary motion of the machine tool upon which the chuck is fitted. This central part 0 is suitably threaded and its threads 7 are engaged by the threads 7, f f which respectively form part of the jaws m m m These jaws are placed in seatings like 0", r suitably formed in the body cl of the chuck, the incline of the jaws m m m corresponding to the angle at the top of the cone of part c.

This part 0 has a collar (1 which forms one.

' pipplicati'onfiied SptEmBer-IS;1931,,Sria1 1105;563:690; ai nd -in-Ihrance-J'anuaw -16, 193E ballracerforiaxbearinggbalilb ithe'otliertside of this. bearing; ball'restingr, on: the, locking nut e1; This locking.nutissthreaded .afi g andrtherbodyd: "of the; chuck has corresponding threads at h, so thatthe/chuck-canebe closed 1 at the; black. by tightening the-nut'ie by -means of. a-tooLinserted-in-the holes t. and-:fi.

Finally the body; (Lof the chuck iS" p.I0.-'

vided witl1'-a-.-flange.z' into whichisdnserted the screw o which. cam. when: requiredlimit and regulate; by; its: positiem; theaxiah-movement. of: thetpartc.

The. chuck works as" followsc. the; central I threaded part? crcontrols; the? movementswof the-jaws m. m mfi'by. meansaofiithe thneads. f engaged-1 with threads fi-ozf the said; part. 50. .This: central. screwed. portion: 0 participates in the motion otthe; machine toolvupon which. the chuck.is-fitted. The jaws-mtggm m sliding in channels 11 e ,-.r -,..made.- inethe;

body otthechuc-k. are movedtrhy relative notary movement. of the. parts; 015; the. chuck,

, the effect being, owing to application; 01% the threads-19Ietc,against. threads fi of-,the.part -c,.to cause agrippingefiect indirect-proportion to thearesisting stress-vimthe-rotary movement... V I j j This, characteristic absolutely. ensures a ping...

The looseningt movement is. facilitated; iremarkably byethe absorption of axial. reactions by the intervening balls I) between. all OIY-Pafllt ot the. sliding or. turning-surfaces in contact, this; intervention preventingall. jammingibetweenf these. surfaces and. gluing a; m1n1mum-:- trlctionaL. resistance.

Another characteristic of; thaimproved is. the facility oi stoppingzoncontrclthe. axial movement of..'the inner movablerparts byemploying the screw ovforming part of. the body d. of thechucknndlcapable of. regulating the axial movement. at .thecen- .trahthreaded. part This screw v Q). can be tightened from/the outside:- afiter. opening. the

jaws m, .,-m,.'m?.. The hole, for thesai'dlscrew Q), can also be usedfor lubricatio rrofitheiinner parts-.gthereotif desired-,.-.this. screw o": can 7 be, omitted and? the..centr.a1'{ part 9.1 can. havea suitably. placedlhearing atits upper; endl'.

5 it i said chuck to all types of machine tools.

The improved chuck is'opened or closed -directly by hand, i; e.,'it s use does not need ping elfect of the jaws increases in proportion to this distance, viz', of the diameter of the object gripped, and thus of the stress to which 1 the jaws m m m are subjected. The cen-,. tral part may have an inner tapered coupling 0 to I'BCBlYQ'thG different kinds of chuck shank in use and enabling the fitting of the any key or other accessory for increasing or decreasing the gr p. 7

Numerous alterations can, of course,'be

-made' in the aforesaid chuck which is described by way of example.

In particular Fig. 4 represents a chuck according to the invention but in which the central part a has not an inner taper 0 but an internal screw 7. Three sets of bearing balls-are provided, one Z), exactly as already explained with reference to'Fig. 2, the other 6 placed between the collar a of the part 0 and the'fiange j of the body of the chuck Z andfinally a third stop,-b between the cen tral part 01and thes'crew '12.

1. A chuck ofthe character described, comprising a body portion provided with a central cavity having aninternal flange to form a seat and a plurality of unobstructed bores V surrounding the cavity and following in their relative positions the outline of a cone, locking jaws having threaded portions and being slidably mounted in the said bores, a threaded central cone disposed inthe cavity and received in said'seat and in mesh with the threads of the jaws to regulate the latter, a ball race and bearing balls interposed between the cone and the body portion of the chuck, andaregulating screw carried by the said flange in contact with the cone to control the longitudinal position thereof.

4:, A chuck of the character described, comprising a body portion provided with a central cavity having an internal flange to form a seat and a plurality of unobstructed bores surrounding the cavity and following in their relative positions the outline of acone, 1ockingjaws having threaded portions and being slidably mounted in said bores','a threaded central cone disposed in the cavity and received inthe seat and i n-me'sh with the threads of the jaws; to regulate-the latter,a

screw adjustable in said flange and in contact with the cone to control the longitudinal, position thereof. e v i J In testimony wherjeofl have signed, this specification. f

PIERRE ULYsE JEANJ AMYOT. a:

' =What I claim as my invention and desire to secure by Letters Patent is 100 a seat'and a plurality of unobstructed bores surrounding the cavity and following in their relative positions the outline of a cone, locking elements slidably mounted in said bores,

a regulating element disposed in the cavity and received in sa1d seat to engage the looking elements, and a regulating screw ad ust- "able in the flange and against the regulating "element thereof.

to control the longitudinal position 2. A chuck of the character described, comprisin'g'a body portion provided with a central'c'avity having an internal flange to form a seat and a pluralityof unobstructedbores surrounding the cavity and-following in their relative positions the'outline of a cone, locking jaws having threaded portions and being slid ably'mounted in the said bores, a

threaded central cone disposed in the cavity "andreceived in said seat andin mesh with the threads of the jaws to regulate the lat I longitudinal position thereof. ,a

3. A chuck of the character described, com- I "prising a body portion provided with a center, and a regulating screw carried by the said tral'cavity having an internal flange to form 7 Gil 

